The orthodontic treatment of mandibular protrusion is as follows: 1, head cap and traction chin pocket orthodontic device: suitable for early skeletal anterior retrusion with mandibular protrusion, can be used in combination with intraoral orthodontic appliances such as jaw pad lingual braces, in the late milk teeth, early replacement period or permanent teeth; 2, anterior traction orthodontic device: suitable for early skeletal anterior retrusion with combined maxillary hypoplasia and mandibular protrusion, can be used in the replacement period or early permanent teeth; 3, functional orthodontic appliances: such as Activator or Frankel III orthodontic appliances. or early permanent teeth; 3. Functional appliances: e.g. Activator or Frankel III appliances. It is suitable for early skeletal anterior antimandibular and functional anterior antimandibular, and can be used during the period of dentition, especially in the late period of dentition; 4. Fixed orthodontic Class III retraction device: mainly used to adjust the intermaxillary relationship, commonly used in early skeletal anterior antimandibular, can be used in the late period of dentition or the early period of permanent teeth. Its intraoral orthodontic device, either removable maxillary and mandibular planes or jaw pad aligners, or fixed aligners, or a combination of both; 5, removable maxillary jaw pad lingual reed aligners: can be used for the correction of any anterior antimandibular, can be used alone or in combination with other orthodontic devices such as chin pockets and other aligners, such as fixed aligners; 6, fixed aligners: adults with anterior antimandibular Such as odontogenic anterior retrusions or mild bony anterior retrusions can be treated with non-orthodontic orthodontic appliances; if combined with significant skeletal deformities, a combination of orthodontic and surgical orthognathic treatment is required.